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《Chinese Journal of Enviromental Science》 2002-03
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Nitrate Accumulation in Vegetables and Its Residual in Vegetable Fields

Wang Zhaohui, Zong Zhiqiang, Li Shengxiu, Chen Baoming(College of Resources and Environmental Sciences, Northwestern Science and Technology University of Agriculture and Forestry, Yangling, Shaanxi 712100, China, E\|mail: zhaohuiw@public.xa.sn.cn)  
Determinations of 11 kinds, 48 varieties of vegetables were carried out at different seasons. The results showed that nitrate\|N concentrations in 20 vegetables reached Pollution Level 4 (NO - 3\|N325 mg·kg -1 ), which accounted for 41 7% of the total number of the sampled vegetables and included all of the leafy, and most of the melon, root, onion and garlic vegetables. Among them, 5 leafy vegetables even exceeded Level 4 (NO - 3\|N700 mg·kg\+\{-1\}). Although leafy vegetables were usually apt to heavily accumulate nitrate, most of them were with nitrate\|N concentrations lower than Level 3 (NO - 3\|N325 mg·kg -1 ) in leave blades. Further investigation showed that vegetable soils accumulated more nitrates in each layer from 0 cm to 200 cm than did cereal crop soil. The total amount of residual nitrate\|N was 1358\^8kg·hm -2 in the 200 cm soil profile of usual vegetable fields, and 1411 8kg·hm\+\{-2\} and 1520\^9kg·hm -2 in the 2\|yaers and the 5\|years long plastic greenhouse fields respectively, however that in the cereal crop fields was only 245\^4 kg·hm -2 . Nitrate residual in vegetable soils formed serious threats to underground water in vegetable growing areas.
【Fund】: 国家重点基础研究专项经费资助项目(G19990 1170 7) ;; 国家自然科学基金项目(49890 330 ;;39970 4 2 9;;30 0 70 4 2 9)
【CateGory Index】: X592
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